Mining machine



C. P. BALDWIN Sep 1936.

MINING MACHINE Filed- OC'b. 24, 1932 5 Sheets-Sheet 1 iw \N b. .w m Qgw: m m Am w @1. N wh@ Sept. 8, 1936.. c. P. BALDWIN MINING MACHINE-Filed Oct. 24, 1932 5 Sheets-'Sheet 2 `@lmlm www Sept. 89 1936. Q pBALDWlN l2,053,259

MINING MACHINE Sept 8, 1936. c. P. BALDWIN 2,053,259

MINING MACHINE Filed Oct. 24, 1932 5 SheetSj-'Shee't 4- i www W hunSept*- 8, 1936- l c. P. BALDWIN 2,053,259

MINING` MACHINE Filed5 oct. 24, 1932 5 sheetssheet 5 Patented Sept. 8,1936 ilNi'lED STATES PATENT orgies MINING MACHINE MassachusettsApplication October 24,

28 Claims.

This invention relates to mining machines, and more particularly toimprovements in the swinging mechanism for the cutter bar of a machinefor mining coal.

An object of this invention is to provide an improved mining machine.Another object is to provide an improved coal mining machine of thelongwall type having improved cutter bar swinging mechanism. A furtherobject is.l to provide an improved swinging mechanism for the cutter barof a longwall coal mining machine whereby the cutter bar may be swung inan 4improved manner wholly independently of the machine feeding means.Yet another object is to provide' an improved cutter bar swingingmechanism having improved driving and controlling means whereby thecutter bar may be swung in either direction about its pivot in animproved manner. Still anotherobject is to provide an improved cutterbar swinging mechanism for a coal mining machine of the flexibly fed.continuous cutter, botto-m cutting floor cutter type, wherein the cutterbar may be swung about its pivot through improved motor opera-lcdmechanism wholly independently of the iiexible feeding means. These andother objects of the invention will, however, hereinafter more fullyappear.

In the accompanying drawings there are shown, for purposes ofillustration, one form and a modication thereof which the invention mayassume in practice.

In these drawings,-

Fig. l. is a plan, view of a longwall coal mining machine with which thepreferred illustrative iorm of the` improved bar swinging mechanism isassociated.

Fig. 2 is a side elevational View of the mining machine shown in Fig. l.

Fig. 3 is a central, longitudinally extending, vertical sectional Viewtaken substantially on line 3-3 of Fig. l.

Fig. 4 is a transverse vertical sectional View taken substantially onAline 4 4 of Fig. 3.

Figs. 5, 6 and 'l are detail views illustrating the improved controlmeans for the bar swinging mechanism.

Fig. 8 is a detail sectional view taken. on line S--S oi Fig. 5.

Fig. 9 is o. detail sectional View taken on line 9-9 of Fig. 3.

Fig. l is an enlarged detail. sectional View of a portion of the barswinging mechanism sho-w71 in Fig. 3.

Fig. l1 is a. horizontal sectional View taken 1932, Serin No. 639,289(

(c1. 26e-so) substantially on line l l-I l of Fig. 3, with the cutterbar swung into a different position.

Fig. 12 is a horizontal sectional view taken substantially on line l2-I2of Fig. 3.

Fig. 13 is an enlarged plan View 0f the m2- chine cutter head showingthe improved bar swing control means, a portion of the bar swingingmechanism being shown in horizontal section.

Fig. 14 is a horizontal sectional View through the machine cutter head,illustrating a modiiied form of construction. Y

Fig.,15 is a detail view taken on line |-l5 of Fig. 14.

Fig. 16 is a central, longitudinally extending, vertical sectional Viewtaken substantially on line Iii-I6 of Fig. 14.

Fig. l'l is a transverse vertical sectional view taken substantially online l'l--ll of Fig. 16.

Fig. 18 is a detail View taken on line l8-l8 of Fig. 14. y

Fig. 19 is a vertical sectional View taken on line IS-IS of Fig. 14.

In the illustrative form of the invention shown in Figs. 1 to 13,inclusive, the improved bar swinging mechanism is shown embodied in acoal mining machine of the exibly fed, continuous cutter, bottom cuttingtype, lherein a longwall machine generally comprising a machine frame lhaving a plane bottom surface Z on which the machine is slidablysupported for movement over the mine oor. As is usual in longwallmachines, pivotally mounted on the rear end ofthe machine frame at 3 forhorizontal swinging movement relative thereto, is a horizontal planecutter bar 4 having guided for circulation about its margin a usualcutter-bit-carrying cutter chain 5, the cutter bar being swingable tosubstantially right-angle positions at either side of the machine frameand to a central position extending longitudinally of the machine frame.The machine is fed overthe mine oor by means of a horizontal feed drum 6located at the front end of the machine and cooperating with a usualfeed cable l anchored to an extraneous abutment located adjacent thecoal face in advance of the machine. Arranged intermediate the machinecutter head 8 on which the cutter bar is pvotally mounted, and the feedframe S which houses the feeding mechanism, is a horizontal motor l0having its power shaft operatively connected to the cutter chain and thefeed drum and driving, through improved mechanism to be later described,the improved cutter bar swinging mechanism. In the present construction,connectible to the rear end of the motor power shaft, as by a `Side ofthe shaft.

usual sliding clutch II, as shown in Fig. 3, is a bevel pinion I2meshing with a bevel gear I3. Rotatable with and driven by the gear I3is a spur gear I4 meshing with a spur gear I5 keyed to a vertical shaftI 6. Also keyed to this vertical shaft is a chain sprocket I1 whichengages and drives the cutter chain 5 in a well known manner. As theparticular construction of the feeding mechanism has no relation to thepresent invention, and as the improved bar swinging mechanism may beassociated with mining machines of various types other than that shown,further illustration and description of the machine structure areconsidered unnecessary.

In the preferred form of the improved bar swinging mechanism there isshown fixed to the cutter head 8, as by bolts 20, a worm gear segment 2I(most clearly shown in Fig. 11) having the pitch circle of its teethstruck from the bar pivot axis; and meshing with the teeth of this wormgear segment is a transverse worm 22 journaled on a horizontal axis onthe cutter bar 4. This worm, as hereinafter described, is connectible toa horizontal shaft 23, herein made hollow to receive a reciprocatorycontrol shaft 24, and the ends of this shaft 23 are journaled withinsuitable bearing sleeves 25, 25 which also form supports for the worm22, the sleeves being journaled within a combined bearing bracket andgear housing 26, herein secured to the cutter bar and ywithin which theworm and worm shaft are arranged. This bracket is herein formed with adetachable cover portion for obtaining access to the worm and itsassociated mechanism, as shown in Figs. 3 and 4. The Worm 22 may berotated in either of opposite directions by the motor while the latterruns continuously in the same direction, and this improved worm rotatingmeans comprises an eccentric 21, herein formed on the hub of the chainsprocket I1, as shown in Fig. 3; and surrounding this eccentric is aneccentric strap 28 formed on a reciprocatory rod or bar 29 guided at 30within a groove on the cutter bar. This rod 29 is provided with a.transverse groove 3| for receiving a cross member 32 guided at its endswithin elongated slots 33 formedin the 0pposite vertical side walls ofthe bracket 26. The transverse member 32 is herein in the form of atrunnion block, and engaging trunnions 34, 34 formed on its oppositeends are forked portions 35 of arms or levers 36, 36 keyed to theopposite ends of the Worm shaft 23. The means for connecting fthe Worm22 to the shaft 23 comprises an intermittent grip device, herein areversible cam and roller clutch generally designated 31; and thisclutch comprises two sets of rollers, the rollers one set being numbered38 and the rollers of the other set being numbered 39; and these rollersare arranged within and engage the bore 40 of the worm 22. These rollersare arranged within recesses Y4I formed in the shaft 23, as shown inFig. 3, and the recesses are formed with inclined surfaces 42 convergingoutwardly at each These recesses are formed with enlarged chambers 43which receive the rollers when the latter are in their released orinoperative position. The shaft 23 is also formed 4with a transverseslot 44 having arranged therein 'reciprocable roller releasing plungersor cam release elements 45 and 46, the plungers 45 coact- For projectingthe there are formed on the shaft 24, in parallel 1ongitudinal planes,notches 41, 48, 49 and 5D, the

rollers 39 engage the inclined surfaces 42 of the recesses and the bore40 of the worm with a wedgf ing action, thereby to eifect intermittentrotation of the worm in a clockwise direction, as viewed in Fig. 3; andas a result the cutter bar is swung from left to right. When the controlshaft S4 is moved axially into its opposite or reverse position, thesemi-circular projections 52 formed on the roller release plungers 45drop into the slots 48, 49 while the plungers 46 are projectedoutwardly, thereby to release the rollers 39 and to render the rollers,38 effective; and upon oscillation of the shaft 23 the worm isintermittently rotated in the reverse or counterclockwise direction, asviewed in Fig. 3, thereby to eifect bar swing from right to left. Whenthe control shaft 24 is in the position shown in Fig. 6, that is, Withall the roller release plungers in their outer projected position, therollers are held in their released position in the enlarged chambers 43of the recesses, thereby wholly disconnecting the oscillatory shaft 23from the worm, the shaft 23 freely oscillating Within the worm when therollers are thus positioned. When the parts are thus disposed, thecutter bar is rigidly locked against swinging movement by theself-locking teeth of the worm engaging teeth of the worm gear segment.The shape and proportions of the members 45, 4tV will be selected toprevent their coaction with the rollers to Wedge,

and to cause them to serve as mere positioning members.

For limiting swinging movement of the cutter bar and for controlling theroller release shaft 24 at will, there are provided appropri- L atelylocated abutments 55 and 56, and the opposite ends of the control shaft24 are provided with buttons 51 for engaging these abutments. When thecutter bar is swung from the full line position shown in Fig. 1 to thedotted line position in that figure, and as the cutter bar reaches thedotted line position, the button on the adjacent end of the shaft 24engages the abutment 56, and upon continued swinging movement of thecutter bar the shaft 24 is shoved inwardly into the position shown inFig. 6, thereby releasing the roller release plungers and disconnectingthe bar swinging mechanism from its drive. When the cutter bar is swungfrom the dotted line position shown in Fig. 1 to the full line positionin that figure, the abutment 55 acts to effect release of the barswinging mechanism from its drive in a similar manner. In this instance,the abutments 55, 56 are made adjustable and are provided with suitableoperating mechanism to enable connection of the bar swinging mechanismto its drive at will. The abutments 55, 56 are respectively pivotallymounted at 58, 58 on the cutter head frame 8, and each has pivotallyconnected thereto at 59 a plunger 69 suitably guided within a strap 6I.The inner adjacent ends of the elements 63 are rounded at 62 forengagement with cam surfaces 63 formed on a rotatable cam member 64,herein rotatably mounted at 65 about an axis coincident with the axis ofbar swing, as shown in Fig. 3, and located at the top of the cutter headframe. For rotating this cam member there is provided a lever 99pivotally mounted at 91 on and overlying the top of the machine frameand having its inner end 99 formed to fit a socket 69 on the cam member.The outer end of this lever is provided with a suitable handle 19, andthe lever is guided by means of a transverse guide bar 1l attached tothe top of the feed frame, as shown in Fig. 1. When the handle 19 of thelever 95 is swung laterally from the position shown in Fig. 1, the cammember 64 is rotated to cause the cam surfaces 93 thereof to project theplungers |59V outwardly, thereby to swing the abutment members 55, 56inwardly about their pivots. Swinging movement of the abutment 55 causesthe roller release shaft 24 to be slid inwardly into its connectedposition, thereby connecting the bar swinging mechanism to its drive, asa result, the cutter bar may be swung from the full line position shownin Fig. 1 to the dotted line position in that figure. When the cutterbar is in the dotted line position in Fig. l, the abutment 59 may beoperated in a similar manner to connect the bar swinging mechanism toits drive. When itis desired to swing the cutter bar to the oppositeside of the machine, the abutments 55, 59 are detached from the ma.-chine cutter head and are replaced by similar abutments 12, 13, and theabutment swinging parts are correspondingly reversed. Suitably locatedbolt holes are provided in the cutter head frame for receiving theholding bolts for the abutments 12 and 13 and the guide straps 9| forthe plungers 99, as shown in Fig. 13. When it is desired to swing thecutter bar from one extreme position at one side of the machine to anextreme position at the opposite side of the machine, the abutments 55,55 and their associated swinging mechanism are removed from the machine,and at this time suitable adjustable abutments 19, 15 threadedly securedwithin bosses 15 integral with the cutter head frame at the oppositesides of the machine, act to release the bar swinging mechanism when thecutter har reaches each eXtreme limit of swinging movement, as shown infull and dotted lines in l1. When it is desired to position the cutterbar in its central position, as indicated in dotted lines in Fig. 11,the bar swinging mechanism may be Vmanually released when it assumes itscentral position. From the foregoing description, it will be evidentthat the cutter bar may be swung in either direction about its pivotwholly independently of the machine feeding means and while the motorand cutting mechanism operate continuously in the same direction, theimproved reversible swinging mechanism being operable at will to eifectpower sving of the cutter bar. It will also be evident that by theprovision of the improved adjustable abutment mechanism the bar swingingmechanism may be automatically disconnected from its drive when thecutter bar reaches its limit of swinging movement in either direction,and may be connected to its drive at will.

1n the modified form of the invention shown in Figs. 14 to 19,inclusive, the cutter chain 5 is driven from the motor power shaftthrough a spur pinion 99 meshing with a spur gear 9 i, which in turndrives a spur pinion 92 meshing with a spur gear 93 fixed to alongitudinally extending shaft 99. This shaft, as shown in Fig. 14, isconnectible by a sliding cutter chain clutch 85 to an alined shaft 96.Fixed to the shaft 86 is a worm 81 meshing with a worm wheel 88 keyed toa vertical shaft 99. Also keyed to this shaft is a chain sprocket 99which engages and drives the cutter chain in a Well known manner. Theimproved bar swinging mechanism in this form of the invention comprisesa spur gear 9| meshing with the motor pinion 89 and driving a spurpinion 92 fixed to a longitudinal shaft 93 and meshing with a spur gear99 journaled on a longitudinally extending shaft 95 herein arranged atthe opposite side of the machine from the shaft 86. Also fixed to theshaft 93 and driven thereby is a spur pinion 95 meshing with anintermediate gear 91 in turn driving a pinion 98 meshing with a spurgear 99 also journaled on the shaft 95. It will thus be seen that thespur gears 94, 99 rotate in opposite directions and constitute areversing mechanism for the shaft 95, and these gears are selectivelyconnectible to the shaft 95 by multiple disc clutches |99 and |9|,respectively. Fixed to the shaft 95 is a worm |92 meshing with a wormwheel |93 secured, as by screws |94, to the cutter bar 4, as shown inFig. 15.

Keyed to the shaft 99 is an eccentric member or f disk |95, and engagingan eccentric groove i942 formed in the upper face of this eccentricmember is a roller |95a carried by a lever |99 pivotallj,7 mounted at|91 and connected at |99 to a shiftable clutch applying member |99slidably mounted on the shaft 95 intermediate the clutches |99 and |9l.The pivotal mounting E91 for the clutch operating lever is madeadjustable, and this adjusting means comprises, as shown in Fig. 19, avertical shaft ||9 having a suitable socket ||i for receiving a suitableturning instrument. Keyed to the lower end of this shaft is a bevel gear||2 meshing with a bevel gear H3 herein formed integral with a nutmember Elfi suitably journaled at ||5 Within the machine cutter head.f.. 'I'his nut member threadedly engages a screw shaft i5, and slidablymounted on this shaft is a trunnion member ||1 to which the clutchoperating lever is pivotally connected. The member |1 is yieldablypositioned on the shaft by washers ||1e and ||1b engaging shoulders H9and ||8ih on the shaft and abutting the opposite ends of the member ||1when the latter is in its central position shown. Coiled springs ||9 andl |9a encircling the shaft and acting on the wash- :i

ers at that time yieldably maintain the lever |95 in the central orneutral position as shown in Fig. 19. The tension of the springs may beadjusted by collars i9b threaded on the shaft. The shaft I9 is guided at|20 within the machine cutter head. It will thus be seen that when theshaf I9 is rotated, the screw shaft i6 is moved asi in one direction orthe other to move the pivotal mounting |91 for the clutch operatinglever into different positions against the tension of the opposingspring. For instance, when the pivotal mounting |91 is shifted in onedirection, the clutch |9| may be operated, while when the pivotalmounting is shifted in its opposite position, the clutch |99 may beoperated. As the eccentric member |95 is rotated during drive of thecutter chain, the lever |99 is oscillated about its pivotal mounting|91, thereby to effect intermittent application and release of thedesired friction clutch. As a result, the shaft 95 may be intermittentlyrotated, and through the worm gearing |92, |93 the cutter bar may beswung about its pivot in either direction under the control of thereverse frictions E99, |9i. In this form of the invention theintermittently rotatable worm M12 functions ina manner similar to theintermittently rotatable worm 22 of the preferred form of the inventionabove described, and when released from the drive acts as a lock for thecutter bar.

As a result of this invention, it will be noted that an improved cutterbar swinging mechanism is provided for a coal mining machine of theilexibly fed, continuous cutter, bottom cutting type, whereby the cutterbar may be swung in either' direction about its pivot whollyindependently of the machine feeding means and without reversal of themachine driving motor and cutting mechanism. It will further be notedthat an improved cutter bar swinging mechanism is provided which is ofan extremely simple nature and which may be operated and controlled inan improved manner. These and other uses and advantages of the improvedbar swinging mechanism will be clearly apparent to those skilled in theart.

While there are in this application specically described one form and amodication thereof which the invention mayassume in practice, it will beundersttod that this form and modication are shown for purposes ofillustration, and that the invention may be further modified andembodied in various other forms without departing from its spirit or thescope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:-

1. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, and mechanism for swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectively, and anintermittent grip device for eiiecting rotation of one of said gearelements relative to the other, said grip device being arranged withinone of said gear elements.

2. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectiveiy and anintermittent grip device mounted to swing with said cutter bar foreffecting rotation of said gear element on said bar relative to saidgear element on said frame, and means for automatically releasing saidgrip device upon a predetermined swinging movement of said cutter bar.

3. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectively and anintermittent grip device mounted to swing with said cutter bar foreffecting rotation of said gear element on said bar relative to saidgear element on said frame, and abutment means on said frame forautomatically releasing said grip device upon a predetermined swingingmovement of said bar.

4. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar abo-ut its pivot includingcooperating gear elements on said bar and frame respectively and anintermittent grip device for effecting rotation of one of said gearelements relative to the other, abutment means for automaticallyreleasing said grip device upon a predetermined swinging movement ofsaid bar, and means associated with said abutment means for actuatingthe latter to effect connection of said grip device in driving relationwith said rotatable gear element.

5. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for. swinging said bar about its pivot in either ofopposite directions including cooperating gear elements on said bar andframe respectively and a reversible intermittent grip device foreffecting rotation of one of said gear elements relative to the other ineither of opposite directions, abutment means for automaticallyreleasing said grip device upon predetermined swinging movement of saidbar in either of opposite directions, and means associated with saidabutment means for actuating the latter to effect connection of saidgrip device in driving relation with said rotatable gear element.

6. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, and mechanism for swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectively, and meansfor effecting rotation of one of said gear elements relative to theother including an intermittent grip device, and an eccentric operatedmechanism for actuating said device including a rotatable eccentricmember arranged with its axis of rotation coincident with the bar pivotaxis, a reciprocatory rod actuated thereby and an oscillatory elementactuated by said rod.

'7. In a mining machine of the floor cutter type, a machine frameadapted to rest upon and slidein any direction over the mine floor,iiexible feeding means for the machine, a kerf cutting cutter barpivotally mounted on said frame, mechanism independent from saidflexible feeding means for swinging saidbar about its pivot includingcooperating gear elements on said bar and frame respectively and a speedreducing device including a nal driving element rotatable relative toand mounted to swing with said cutter bar forreffecting rotation of saidgear element on said bar relative to said gear element on said frame,and means for automatically releasing said device upon a predeterminedswinging movement of said cutter bar.

8. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism Vfor swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectively and a speedreducing device for eiecting rotation of one of said gear elementsrelative to the other, abutment means for automatically releasing saiddevice upon a predetermined swinging movement of said bar, and meansassociated with said abutment means for actuating the latter to eifectconnection of said device in driving relation with said rotatable gearelement.

9. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar about its pivot in either ofopposite directions including cooperating gear elements on said bar andframe respectively and a reversible speed reducing device for eiectingrotation of one of said gear elements relative to the other in either ofopposite directions, abutment means for automatically releasing saiddevice upon predetermined swinging movement of said bar in either ofopposite directions, and means associated with said abutment means foractuating the latter to eirect connection of said device in drivingrelation with said rotatable gear element.

10. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar about its pivot includingcooperating gear elements onA said bar and frame respectively, anintermittent grip de-` vice for eiecting rotation of one of said gearelements relative to the other, means for driving said device, and meansoperable at will for ,connecting said device in or releasing the samefrom driving relation with said rotatable gear element including arotatable operating element coaxial with the bar pivot.

11. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, mechanism for swinging said bar about its pivot includingcooperating gear elements onl said bar and frame respectively and anintermittent grip device for effecting rotation of one of said gearelements relative to the other, and means operableat will for connectingsaid device in or releasingfthe same from driving relation with said'rotatable gear element including a rotatable operating element coaxialwith the bar pivot and actuating means for said operating elementoperable from the end ofthe machine remote from the cutter bar.

12. In a mining machine, a machine frame, kerf cutting mechanism thereonincluding a pivoted cutter bar, cutting elements on said bar and drivingmeans for said cutting elements including a driving gear coaxial withthe bar pivot and a co-v axial element driven thereby for engaging thecutting elements, and mechanism for swinging said bar about its pivotincluding cooperating gear elements on said bar and frame respectively,

and means actuated by an element of said cutterl element driving meansfor eiecting intermittent rotation of one of said gear elements relativeto the other and including an eccentric mechanism arranged between saidgear and said cutter element engaging element and intermittent devicesactuated by said eccentric mechanism and mounted to swing with saidcutter bar.

13. In a mining machine, a machine frame, kerf cutting mechanism thereonincluding a pivoted cutter bar, cutting elements on said bar and drivingmeans for said cutting elements including al driving gear coaxial withthe bar pivot and a coaxial element driven thereby for engaging thecutting elements, and mechanism for swinging said bar about its pivotincluding cooperating gear elements on said bar and frame respectively,and means actuated by an element of said cutter element driving meansfor effecting intermittent rotation of one of said gear elementsrelative to the other and including an eccentric mechanism arrangedAbetween said gear and said cutter element engaging element, saideccentric mechanism including an eccentric and a longitudinallyreciprocable rod guided within said frame and actuated by said eccentricand intermittent devices actuated by said eccentric mechanism andmounted to swing with said cutter bar.

14. In a mining machine, a machine frame, kerf cutting mechanism thereonincluding a pivoted cutter bar, cutting elements on said bar and drivingmeans for said cutting elements including a driving gear coaxial withthe bar pivot and a coaxial element driven thereby for engaging thecutting elements, and mechanism for swinging said bar about its pivotincluding cooperating gear elements on said bar and frame respectively,and means actuated by an element of said cutter element driving meansfor effecting intermittent 4rotation of one of said gear elementsrelative to the other and including an eccentric mechanism arrangedbetween said gear and said cutter element engaging element, saideccentric mechanism including an eccentric, a longitudinallyreciprocable rod guided Within said frame and actuated by said eccentricand an oscillatory element actuated by said rod, said rod andoscillatory element mounted to swing with said cutter bar.

15. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, and mechanism for swinging said bar about its pivot includingcooperating gear elements on said bar and frame respectively, and anintermittent grip device arranged within one of said gear elements foreffecting intermittent rotation of one of said gear elements relative tothe other, said device including a member having oscillatory movementabout the axis of the gear element within which said device is arranged,grip elements actuated by said oscillatory element for gripping saidgear element, and means coaxial with said oscillatory element forconnecting the grip elements in or releasing the same from drivingrelation with said gear element and including a controlling plungerarranged within and movable axially of said oscillatory element.

16. In a mining machine, a frame, a plane cutter bar pivotally mountedthereon to swing in its plane relativeV thereto, motorfoperated meansincluding driving elements mounted to swing -with said cutter bar forswinging the cutter bar about its pivot to form an arcuatekerf in themine Wall, and means onsaid frame for automatically disconnecting saidmotor operated means upon a predetermined swinging movement of said bar.

17. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, motor operatedrmeans for swinging said cutter bar about itspivot including bar swing driving connections including a friction discclutch, and means automatically loading and Yreleasing the discs of saidclutch including an eccentric arranged wit' its axis alined with the barpivot axis, and clutch operating means actuated by said eccentric.

18. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, motor operated devices for swinging said cutter bar about itspivot in either of opposite directions including cutter bar swingingconnections including friction disc reversing clutches, and means forintermittently loading and unloading the discs of one of said clutchesto effect bar swing in one direction or the other of said clutches toeffect bar swing in the opposite direction including an eccentricarranged with its axis alined with the bar pivot axis, and clutchoperating means actuated by said eccentric.

19. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, and motor operated means for actuating said kerf cutterincluding cutter driving gearing, and motor operated devices forswinging said cutter bar about its pivot including bar swing drivinggearing entirely independent from said cutter driving gearing andvariable speed driving means adjustable at will during bar swing forintermittently drivintermittent bar swinging mechanism operativelyconnected to said bar, and associated means for varying the operation ofsaid intermittent mechanism for varying the rate of bar swing, saidassociated means being adjustable at Awill to obtain a wide range ofintermittent swinging speeds between zero and a predetermined maximumand continuous swing at said predetermined maximum low speed.

21. In a mining machine of the iioor cutter type, a machine frameadapted to rest upon and slideV in any direction over the mine oor,iieXible feeding means for the machine, a kerf cutting cutter barpivotally mounted on said frame, motor operated means entirelyindependent from said flexible feeding means for swinging said cutterbar about its pivot including an intermittent bar swinging mechanismoperatively connected to said bar and including a friction clutchthrough which power is transmitted to eiect bar swing, means forintermittently applying and releasing said clutch at predetermined timeintervals, and associated means for varying the intervals of applicationand release of said clutch to vary the rate of bar swing.

22. In a mining machine of the longwall floor cutter type, a low compactmachine frame adapted to rest upon and slide in any direction ove1` themine iioor, flexible feeding means for the machine, a keri cuttingcutter bar pivotally mounted on said frame at one end thereof, motoroperated means entirely independent from the iiexible feeding means forswinging said cutter barV about its pivot, and means operable from theend of the machine frame remote from the bar pivot for controlling saidbar swinging means.

23. In a mining machine, in combination, Inachine feeding means, kerfcutting means includlng a cutter bar pivotally mounted for swingingmovement, and motor operated means operable independently of the machinefeeding means for swinging said cutter bar about its pivot including barswinging driving connections, said driving connections including afriction disc clutch, and means actuated by an element of said motoroperated means for intermittently loading and unloading the discs ofsaid clutch at timed intervals.

24. In a mining machine, in combination, ma-

aofaaeeeV chine feeding means, kerf cutting means including a cutter barpivotally mounted for swinging movement, and motor operated meansoperable independently of the machine feeding means for swinging saidcutter bar about its pivot in either 0f opposite directions includingalternatively operable friction disc reversing clutches and meansactuated by an element of said motor operated means for intermittentlyloading and unloading the discs of either clutch.

25. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, motor operated means for swinging said cutter bar about itspivot including an intermittent grip device mounted to swing with saidcutter bar, and means arranged coaxially with said device for reversingthe direction of operation thereof at will.

26. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, and motor operated means for swinging said cutter bar `aboutits pivot including an intermittent grip device and a plunger arrangedcoaxially with said device for releasing said grip device at will. 27.In a mining machine, a machine frame, a

cutter bar pivotally mounted thereon, and motor ff operated means forswinging said cutter bar about its pivot including a driven memberhaving a bore, a ratchet device arranged within said bore, and a plungerarranged coaxially with said ratchet device for releasing the same atwill.

28. In a mining machine, a machine frame, a cutter bar pivotally mountedthereon, a driving motor, and mechanism operated by said motor forswinging said bar about its pivot selectively in opposite directionsincluding cooperating gear 5.1.

elements, one on said bar and one on said frame, and means for eiectingrotation of one of said gear elements relative to the other to effectbar swing including in coaxial relation with said rotated gear elementselectively reversely effective intermittent-motion transmitting meansoperative to effect step-by-step bar swing in either direction whilesaid motor operates continuously in a single direction, and meansadjustable in a direction longitudinally of the axis of said rotatablegear element for controlling said intermittent-motion transmitting meansto determine the direction of rotation of said gear.

CLYDE P. BALDWIN.

CERTIFICATE OF CORRECTION,

Patent No. 2,053,259. September 8, 1936.

CLYDE P. BALDWIN.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring Correction as follows: Page 3,second column, line 62, for the Word "direction" read position: page 5,second column, line 57, claim 1'7, for "releasing" rea-d unloading; andthat the said Letters Patent should be read with these correctionstherein that the same may conform to the record of the case in thePatent Office.

Signed and sealed this lst day of December, A, D. 1956.

Henry Van Arsdale (Seal) Acting Commissioner of' Patents..

